Synchronisation of line-coded digital PPM in repeatered transmission systems
作者:
WangYichao,
J.J.O'Reilly,
期刊:
IEE Proceedings F (Communications, Radar and Signal Processing)
(IET Available online 1987)
卷期:
Volume 134,
issue 4
页码: 377-382
年代: 1987
DOI:10.1049/ip-f-1.1987.0065
出版商: IEE
数据来源: IET
摘要:
Line coding is shown to provide an effective means of controlling modulation jitter associated with digital pulse-position modulation (PPM), enabling simple phase-locked-loop (PLL) timing extraction circuits to be employed. The combination of a specific 9B2-32 code and a suitably designed third-order PLL with a maximally flat response is proposed and studied for the purpose of obtaining at dependent regenerators both frame and slot synchronisation signals. Jitter accumulation along a chain of such synchronisers is considered and shown to be acceptable, establishing that the combination of 9B2-32 line code and PLL synchroniser is well suited to repeatered digital PPM transmission.
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